KR20100065207A - Voice and data communication services using orthogonal sub-channels - Google Patents

Abstract

A method for using orthogonal sub-channels (OSCs) in a wireless transmit/receive unit (WTRU). A capability report is received from the WTRU, including an indication whether the WTRU supports OSCs. A determination is made whether to use OSCs for the WTRU and the result of the determination is signaled to the WTRU. If OSCs are used with the WTRU, the signaling includes an OSC assignment for the WTRU. In one embodiment, two resources are assigned to the WTRU and each resource is assigned to a different OSC.

Description

Voice and data communication services using orthogonal subchannels {VOICE AND DATA COMMUNICATION SERVICES USING ORTHOGONAL SUB-CHANNELS}

The present invention relates to a wireless communication system.

The concept of using an orthogonal sub-channel (OSC) (or referred to as Multiple Users Reusing One Timeslot (MUROS)) to double voice capacity, Was introduced. The OSC concept allows a network to multiplex two wireless transmit / receive units (WTRUs) in which the same radio resources are distributed. Subchannels are separated by using an uncorrelated training sequence. The first subchannel may use an existing training sequence and the second subchannel may use a new training sequence for both downlink and uplink. Alternatively, only new training sequences or only existing training sequences may be used on a subchannel. Using OSC can double voice capacity with negligible effects on the WTRU and the network. The OSC is a traffic channel (e.g., full rate traffic channel (TCH / F), half rate traffic channel (TCH / H) modulated in Gaussian minimum shift keying (GMSK). ), The associated slow associated control channel (SACCH), and the fast associated control channel (FACCH).

One current goal of using MUROS is to increase the voice capacity of the system. For example, voice capacity can be increased by having two circuit switched voice channels (ie, two separate calls) on the same radio resource. By changing the modulation of the signal from GMSK to QPSK (where one symbol maps to two bits), two users-the first user on the X axis of the constellation and the second user on the Y axis of the constellation- It is relatively easy to separate them. The network only sends one signal, but it contains information about two different subchannels (users).

In the downlink, the OSC concept is quadrature phase shift keying (QPSK), which may be, for example, a subset of 8PSK constellations used for enhanced general packet radio service (EGPRS). ) May be realized in a transmitter of a base station (BS) using constellations. The modulation bits are mapped to QPSK symbols ("pair bits"), so that the first subchannel (OSC-0) is mapped to the most significant bit (MSB), and the second subchannel (OSC-1) is the least significant bit. mapped to (least significant bit; LSB). Both subchannels may use a separate ciphering algorithm, such as A5 / 1 or A5 / 3. Several options for symbol rotation may be considered and optimized by different criteria. For example, a symbol rotation of 3π / 8 is the same as for EGPRS, a symbol rotation of π / 4 is similar to π / 4-QPSK, and a symbol rotation of π / 2 will provide a subchannel to mimic GMSK. Can be. Alternatively, the QPSK signal constellation may be designed to appear as a legacy GMSK modulated symbol sequence on at least one subchannel (eg, it is legacy compliant).

Another way to realize the OSC concept in the downlink is to multiplex two WTRUs together by transmitting two separate GMSK modulated bursts per timeslot. When there are other multiplexed users, an interference cancellation type receiver can be used for reasonable demodulation performance. This does not exclude at least one multiplexed user from using a conventional type of equalizer receiver.

In the uplink, each WTRU may use a regular GMSK transmitter with an appropriate training sequence. The BS generally cancels interference, such as a space time interference rejection combining (STIRC) receiver or a successive interference cancellation (SIC) receiver, to receive orthogonal subchannels used by different WTRUs. Or a receiver of the joint detection type.

In general, during an OSC mode of operation, the BS may use a dynamic channel allocation to maintain a difference in the received uplink signal level and / or downlink signal level of the same allocated subchannels, eg, within a ± 10 dB window. Apply downlink and uplink power control in a DCA) manner, but the target value may depend on the type of receiver multiplexed together and other criteria.

The basic OSC or MUROS concept may or may not work with frequency hopping or user diversity schemes in the DL, UL, or both. For example, on a frame-by-frame basis, subchannels can be distributed to different pairs of users, and on a time-slot basis, the pair repeats in the pattern for an extended period, such as some frame period or some block period. Can be. These ideas presented here apply equally to modifications of the baseline OSC or MUROS concept.

The OSC or MUROS concept has been proposed to increase voice capacity in GSM systems. However, although voice is an important multiplexing case, in practice the GSM / EGPRS system also relies on more sophisticated service multiplexing scenarios such as packet switched (PS) services over GPRS / EGPRS, simultaneous support of voice and data over DTM, etc. . Unless the MUROS concept is extended to also allow operation in this additional service scenario, the benefits are limited to voice channel multiplexing only.

Therefore, it is desirable to explore other advantageous applications of the OSC concept.

One limitation of legacy GSM / EGPRS technology is that since each timeslot can contain only one burst, legacy GSM / EGPRS technology uses a multislot class and the number of simultaneous receive timeslots per frame, simultaneous transmit timeslots Limit the number of simultaneous transmit / receive timeslots. This limits the data rate achievable in a GSM system, indirectly reduces capacity, multiplexing gain, and artificially incurs access or transmission delays because of waiting for a transmission or reception opportunity. The methods and procedures seek to improve these aspects.

The MUROS concept has the potential to provide more solutions than increasing voice capacity. For illustrative purposes and where applicable, the described methods are described with respect to subchannels OSC-0 and OSC-1, which can be realized using, for example, QPSK type modulation.

 In the first embodiment, the individual subchannels OSC-0 and OSC-1 realized via the OSC or MUROS concept are used to carry data channels, as used for GPRS or EGPRS communication in the PS domain. The individual subchannels available per timeslot may be distributed to one user or one or more users. For example, while subchannel OSC-0 carries the PDTCH of the first user, the second subchannel may carry the PDTCH of the second user. Otherwise, while the first subchannel carries the first PDTCH of the first user, or the data portion of the data block, the second subchannel carries the second PDTCH, or data portion of the data block of the first user.

In the second embodiment, the individual subchannels OSC-0 and OSC-1 are used separately for voice and data communication. Voice service may be provided via a circuit switched (CS) connection or a PS connection. Similarly, data services may be provided via either a CS connection or a PS connection. The voice service and data service provided on the subchannel may belong to different users or to the same user. In particular, the latter case deals with dual transfer mode (DTM). Partitioning and distributing services between voice and data is used with various embodiments of physical layer multiplexing.

According to the invention, it is possible to explore other advantageous applications of the OSC concept.

A more detailed understanding may be obtained by understanding the following detailed description given by way of example in conjunction with the accompanying drawings.
1 shows two OSCs as subchannels of a QPSK modulation constellation.
2 shows four OSCs as subchannels of 16-QAM modulation constellation.
3 shows an alternative implementation of four OSCs as subchannels of 16-QAM modulation constellation.
4 is a block diagram of a WTRU and a base station configured to implement an OSC.

In the following description, the term "wireless transmit / receive unit (WTRU)" refers to a user equipment (UE), mobile station, fixed subscriber unit or mobile subscriber unit, pager, cellular telephone, personal assistant (PDA), computer, or wireless environment. And any other type of user device that may be, but is not limited to these examples. In the following description, the term “base station” includes, but is not limited to, a Node B, a site controller, an access point (AP), or any other type of interfacing device capable of operating in a wireless environment.

In the first embodiment, the individual subchannels OSC-0 and OSC-1 realized through the OSC or MUROS concept are used to carry the data channel as used for GPRS or EGPRS communication in the PS domain. The individual subchannels available per timeslot may be distributed to one user or one or more users. For example, while subchannel OSC-0 carries the PDTCH of the first user, the second subchannel may carry the PDTCH of the second user. Otherwise, while the first subchannel carries the first PDTCH of the first user, or the data portion of the data block, the second subchannel carries the second PDTCH, or data portion of the data block of the first user.

In the second embodiment, the individual subchannels OSC-0 and OSC-1 are used separately for voice communication and data communication. Voice service may be provided via a circuit switched (CS) connection or a PS connection. Similarly, data services may be provided via either a CS connection or a PS connection. The voice service and data service provided on the subchannel may belong to different users or to the same user. In particular, the latter case deals with dual transfer mode (DTM). Partitioning and distributing services between voice and data is used with various embodiments of physical layer multiplexing.

In the first state-of-the-art DTM mode, one resource (eg, one timeslot) is used half of the time for voice call and half the time for packet data. In particular, the Half Rate (HR) mode of DTM operation distributes one CS timeslot every two frames, while the same timeslot of intermittent frames is used for the PS data of that user. For example, a user can make a voice call while downloading an email in the background. Since this uses each resource for only half the time, the DTM in HR mode actually lowers throughput in the PS domain. OSC or MUROS concept by using a second subchannel on another subset of frames to carry PS data for the same user while using the first subchannel on a subset of frames to carry CS voice for the user This applies to this mode of DTM operation. For example, OSC-0 is used on timeslot # 2 of all even frames to carry CS voices, while OSC-0 on timeslot # 2 of all odd frames is used to carry PS data in a DTM configuration. . In the DTM HR mode, voice frames are carried on the half rate CS traffic channel (TCH / H), and packet data is carried on the half rate packet data traffic channel (PDTCH / H). Enable all of the channels to be transmitted in a single timeslot.

As an alternative to the DTM HR mode, the DTM can also be used in multiple timeslot modes. In this mode, one full rate TCH and one or more adjacent full rate PDTCHs are used. This mode of DTM operation requires more than one transmit timeslot and / or more than one receive timeslot per frame (eg, multislot operation). The OSC or MUROS concept applies to this mode of DTM operation by varying the number of subchannels to distribute the timeslot to carry the user's CS voice and PS data. For example, a first subchannel is used on the first timeslot to carry CS voice. The second subchannel is used on the second timeslot to carry PS data for the same user. The second subchannel on the second timeslot may or may not be multiplexed with another user's CS voice or PS data communication. More than one timeslot or subchannel may be used per period (eg, frame) to carry PS data. For example, if timeslot # 2 using OSC-0 carries the CS voice of the user, timeslot # 3 and timeslot # 4 using OSC-1 carry the PS data of that user. As will be apparent to one skilled in the art, this concept is flexible and extensible to include multiple timeslot combinations.

However, if a WTRU is MUROS capable, one user can use MUROS. The WTRU signals the network its MUROS capability (ie, whether it supports MUROS). The network determines whether the WTRU will be able to use MUROS and conveys the decision at the allocation stage. In one implementation, the decision is included in an extension of the existing assignment message. When the network allocates a voice traffic channel (typically a resource), the network informs the WTRU that it is a MUROS assignment and indicates which subchannels are reserved for the WTRU.

The network determines whether to use MUROS for a particular WTRU. Note that using MUROS increases the interference generated, so this may be the opposite of using MUROS for a particular WTRU. The network may perform balancing as to whether to apply MUROS for a particular WTRU. This network side decision, including which threshold and which evaluation criteria to use, is the implementation left to the network operator.

In one implementation, the voice call is placed on the first subchannel and the packet data call is placed on the second subchannel. The voice call is established in the current manner and at the same time the second subchannel is used for packet data.

The MUROS scenario can be applied to a single user by assigning two different resources to the same user. It is possible to assign two parallel CS connections for the same user so that one CS connection is used for the voice call and another CS connection is used for the data call (eg, modem to modem connection). It is possible to use two parallel CS connections even if no PS connection is allowed.

The WTRU may transmit without change. Since the base station receives two bursts at about the same time, the base station needs a method for distinguishing the two bursts. The base station may use interference cancellation to determine which burst came from which WTRU. The base station can receive two bursts from two different sources at about the same time and separate them into two different channels. The way that the network handles locally is uplink scenario specific to the implementation.

The modulation in UL and DL is different. In the UL, the WTRU uses GMSK as before. Using MUROS, two WTRUs transmit to the base station at the same time. One way to identify different WTRU transmissions in the same burst is to use different training sequences (midambles). These trading sequences are signaled to each WTRU over the channel and orthogonal to each other to minimize the interference caused by simultaneous transmission.

On the DL, the base station sends one burst using QPSK modulation, in which one symbol represents two information bits. There is a need for a method for identifying each WTRU to which bits belong. In one implementation, the most significant bit belongs to the first WTRU and the least significant bit belongs to the second WTRU. Since only one burst is sent, the training sequence is the same for all WTRUs on the DL.

Voice and data communication

In the first embodiment, the individual subchannels OSC-0 and OSC-1 are used separately for voice and data communication. Voice service may be provided via a CS connection or a PS connection. Similarly, data services may be provided via either a CS or PS connection. Voice and data provided on a subchannel may belong to different users or to the same user. Partitioning and distributing services between voice and data is used with various embodiments of physical layer multiplexing.

For example, a subchannel OSC-0 using a CS voice traffic channel is distributed to a first user, and a second user on the multiplexed OSC-1 subchannel uses a PS data traffic channel. One user or both users may use a full rate configuration or a half rate configuration. In a second example, subchannel OSC-0 using the CS voice traffic channel is distributed to the first user, and the second subchannel OSC-1 (or its distinctive occurrence) carries PS data as in the case of DTM operation. . In a third example, one subchannel is distributed to the first user to carry both voice and data traffic channels. The second subchannel is distributed to the second user. In a fourth example, the subchannel carries both voice and data traffic (SMS constitutes a special case of data traffic) or a combination of the two. As will be clearly understood from these examples, many configurations of this concept may be applied.

In a second embodiment, an extension of the physical layer multiplexing concept is proposed. 1 shows an example in which the OSC is realized as a subchannel of the QPSK modulation constellation. It should be noted that OSC-0 and OSC-1 are shown by way of example on the x and y axes of the constellation. Those skilled in the art will appreciate that symbols may exist at any point in the constellation. However, to maintain orthogonality between OSC-0 and OSC-1, constellation points will appear square.

In a third embodiment, subchannels are defined with respect to selected subgroups of constellation points. 2 shows an example of 16-QAM modulation, where four OSCs are defined. This provides more flexibility for distributing different amounts of energy to each sub constellation. For example, in FIG. 2, the individual channels have the same average symbol energy.

Different symbol  Orthogonal Subchannels with Energy

In the second definition of OSC, the subchannels have different average symbol energy amounts when compared to each other. In FIG. 3 (also 16-QAM modulation), as shown at each position of the constellation, OSC-0 has the highest average symbol energy, and OSC-1 and OSC-2 are the next highest average symbol energy. OSC-3 has the lowest amount of average symbol energy.

In this case, an adaptive distribution of subchannels is advantageous to the user. For example, the subchannel with the highest average symbol energy is assigned to the user with the weakest channel, compared to the channel of other users. The subchannel with the lowest average symbol energy is assigned to the user with the least weakened channel. As the user moves, dynamic channel reallocation is done to further optimize radio resource utilization. In one embodiment, channel assignment uses an allocation command or a handover command.

 Another application of uneven energy subchannels is the simultaneous supply of data streams with variable quality of service (QoS) requirements. Data streams with more stringent QoS requirements are mapped onto subchannels with higher symbol energy and vice versa.

For the single user case, another application applies CS voice and CS data for the same user on the same physical channel on a full rate basis. This is different from DTM, where the user connects to CS and PS at the same time on a half rate basis. The assigned data channel can be, for example, one of the 14.4, 9.6, or 4.8 kbps channels defined for GSM CS data. The only requirement is that the WTRU be capable of QPSK modulation and demodulation, or any equivalent MUROS modulation scheme that can provide two or more subchannels per timeslot.

Another possibility for the single user case is to multiplex the two CS applications. Assuming the most important CS application is voice, a scenario is possible where a channel for CS voice is assigned to a user according to a legacy procedure. At this point, the network knows the WTRU capability since the WTRU capability is signaled during the call setup signaling phase. If the WTRU and the network need to communicate about another application, it can be set up using CS resources and the network can assign an OSC channel configuration to this WTRU. Another example of a CS service for executing in parallel with a voice service may be a mobile originating SMS as well as a mobile incoming SMS, Unstructured Supplementary Service Data (USSD), and the like.

For example, a user sending and receiving voice over a traffic channel may receive a second message to carry additional signaling messages, SMS, USSD, etc. without waiting for an appropriate transmission opportunity in GSM multi-frame or "stealing" a voice resource. Subchannels may be allocated. This improves link robustness for the first traffic channel, while reducing transmission latency and limiting capacity for this data type. It should be noted that current GSM system designs support the transmission of SMS and USSD data. However, a problem with current solutions is that both the WTRU and the network need to convey information other than voice information. This in some cases results in using the SACCH for reasons other than sending voice resources and sending "measurement reports and system information" by using the FACCH. Stolen voice resources degrade voice quality, but using SACCH for other purposes affects link performance when SMS messages are combined.

Single user with parallel application

Focusing on a single user approach, we propose several solutions for transmitting two parallel applications (eg voice and CS data) in the UL direction.

1. Indicate QPSK. The simplest solution is to indicate QPSK modulation in the DL and QPSK demodulation in the BS for the WTRU for single user channel assignment.

The following solution may be used when the WTRU does not support QPSK modulation in the UL or the BS cannot demodulate the QPSK.

2. Use of discontinuous transmission. Because the user, and therefore the WTRU, is on average silent during half of the voice conversation, the WTRU and the network use this silent period and apply Discontinuous Transmission (DTX). In GSM, when DTX is active, the WTRU sends Silent Descriptors (SIDs) with a predefined number of frames. In general, the WTRU sends eight SID frames during one SACCH frame (ie, 104 TMDA frames). This means that the WTRU uses 12 frames from 104 available frames when the DTX is active. Also, because there are four idle frames in 104 frames, 104-16 = 88 frames are available. Therefore, all or a subset of the 88 frames may be used by the WTRU for CS data transmission in the UL.

3. Use two training sequences. Another solution is to use two training sequences instead of one training sequence. The BS assigns a channel of the OSC configuration to the WTRU as a single user. For the UL, the WTRUs are assigned two different training sequences with separate Training Sequence Codes (TSCs). For example, when the WTRU sends voice information, the WTRU uses the first training sequence on its transmitted burst. When the WTRU switches to sending CS data, the WTRU applies a second training sequence on the burst. This solution simplifies the detection mechanism at the BS.

4. Ability indication. When the WTRU indicates its OSC capability to the network, it also indicates that a single user channel assignment can be supported only in the DL (and not in the UL). This means that the WTRU can receive CS data in the DL in parallel with voice, but cannot send voice and CS data in parallel in the UL. Furthermore, the same signaling capability can be applied to distinguish DL, UL, or simultaneous CS / CS or CS / PS voice / data support in DL and UL. In one implementation, this capability is signaled via extension or delta for the multislot class capability indicated by the WTRU for voice service, (E) GPRS, or DTM.

Illustrative WTRU  And BS

4 is a block diagram of a WTRU 402 and a BS 404 configured to implement OSC. In addition to the components that can be found in a typical WTRU, the WTRU 402 includes a processor 410, a receiver 412, a transmitter 414, and an antenna 416. Processor 410 is configured to transmit multiple OSCs on the UL and receive multiple OSCs on the DL. Receiver 412 and transmitter 414 are in communication with processor 410. Antenna 416 communicates with both receiver 412 and transmitter 414 to facilitate the transmission and reception of wireless data.

In addition to the components that may be found in a typical BS, BS 404 includes a processor 420, a receiver 422, a transmitter 424, an antenna 426, and an interference canceller 428. Processor 420 is configured to transmit multiple OSCs on the UL and receive multiple OSCs on the DL. Receiver 422 and transmitter 424 communicate with processor 420. Antenna 426 communicates with both receiver 422 and transmitter 424 to facilitate the transmission and reception of wireless data. Interference canceller 428 is used to allow BS 404 to simultaneously receive two UL signals from the WTRU.

Examples

Embodiment 1. A method for using orthogonal subchannels (OSC) for a given wireless transmit / receive unit (WTRU), comprising: capability reporting from a WTRU, the capability report including an indication of whether the WTRU supports OSC -Receives; Determine whether to use an OSC for the WTRU; Signaling the result of the determination to the WTRU.

Embodiment 2 The method of embodiment 1, wherein if the OSC is used in the WTRU, the signaling includes OSC assignment for the WTRU.

Embodiment 3 The method of Embodiment 2, further comprising allocating two different resources to one WTRU.

Example 4 The method of example 3, wherein each resource is assigned to a different OSC.

Embodiment 5 The method of embodiment 3 or 4, wherein the two resources are sent in one burst using a four phase shift modulation scheme.

Embodiment 6 The method of embodiment 5, wherein the most significant bit of the burst belongs to one resource and the least significant bit of the burst belongs to another resource.

Embodiment 7 The method of any one of embodiments 3 to 6, wherein the two resources comprise two circuit switched connections.

Embodiment 8 The method of any one of embodiments 3-6, wherein the two resources comprise one circuit switched connection and one packet switched connection.

Embodiment 9 The method of any one of embodiments 3-8, wherein one resource is a voice call and another resource is a data transmission.

Embodiment 10 The method of embodiment 9, further comprising applying discontinuous transmission at the WTRU for the voice call, wherein the data is transmitted during the silence period of the voice call.

Embodiment 11. The method of any one of embodiments 3-10, further comprising: assigning a first training sequence to one resource; Assigning a second training sequence to another resource, wherein the first transmission sequence is different from the second transmission sequence.

Embodiment 12 A wireless transmit / receive unit configured to perform the method of any one of embodiments 1-11.

Embodiment 13. A wireless transmit / receive unit configured to use orthogonal subchannels (OSC), comprising: an antenna; A receiver in communication with the antenna; A transmitter in communication with the antenna; A processor in communication with the receiver and the transmitter, the processor configured to decode a signal received via an OSC and to encode a signal for transmission via the OSC.

Embodiment 14 A base station configured to perform the method of any one of Embodiments 1-11.

Embodiment 15 A base station configured to use orthogonal subchannels (OSC), comprising: an antenna; A receiver in communication with the antenna; A transmitter in communication with the antenna; A processor in communication with the receiver and the transmitter, the processor configured to decode a signal received via an OSC and to encode a signal for transmission via the OSC.

Embodiment 16 The base station of Embodiment 15, further comprising an interference canceller in communication with the receiver and the processor, wherein the interference canceller is configured to cancel interference from a received OSC, wherein the base station is comprised of two OSCs. Can be simultaneously received.

Although features and components of the present invention have been described in particular combinations in the preferred embodiments, each feature or component may be used alone without the other features and components of the preferred embodiments, or other features of the preferred embodiments. And may be used in various combinations with or without elements. The methods or flow charts provided herein can be implemented with computer programs, software, or firmware embedded in a computer readable storage medium for execution by a general purpose computer or processor. Examples of computer readable storage media include read only memory (ROM), random access memory (RAM), registers, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magnetic optical media, and CD-ROMs. Optical media such as discs, and digital versatile discs (DVDs).

Suitable processors include, for example, general purpose processors, special purpose processors, conventional processors, digital signal processors (DSPs), multiple microprocessors, one or more microprocessors associated with DSP cores, controllers, microcontrollers, application specific integrated circuits ( ASIC), field programmable gate array (FPGA) circuits, any other type of integrated circuit (IC), and / or state machine.

The processor associated with the software may be used to implement a radio frequency transceiver for use in a wireless transmit / receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer. WTRUs include cameras, video camera modules, videophones, speakerphones, vibrators, speakers, microphones, television transceivers, handfree headsets, keyboards, Bluetooth® modules, frequency modulation (FM) wireless units, liquid crystal display (LCD) display units, organic To be used with modules implemented in hardware and / or software, such as light emitting diode (OLED) display units, digital music players, media players, video game player modules, Internet browsers, and / or any wireless local area network (WLAN) modules. Can be.

402: WTRU 404: base station
410, 420: Processor 412, 422: Receiver
414, 424: transmitter 416, 426: antenna
428: interference canceller

Claims (14)

A method for using orthogonal sub-channels (OSCs) for a given wireless transmit / receive unit (WTRU),
Receive a capability report from a WTRU, the capability report including an indication of whether the WTRU supports OSC;
Determine whether to use an OSC for the WTRU;
Signaling the result of the determination to the WTRU
Method for using the OSC for a WTRU comprising a. The method of claim 1, wherein if an OSC is used at the WTRU, the signaling comprises an OSC assignment for the WTRU. 3. The method of claim 2, further comprising allocating two different resources to one WTRU. 4. The method of claim 3 wherein each resource is allocated to a different OSC. 5. The method of claim 4, wherein the two resources are sent in one burst using a four phase shift modulation scheme. 6. The method of claim 5, wherein the most significant bit of the burst belongs to one resource and the least significant bit of the burst belongs to another resource. 4. The method of claim 3, wherein the two resources include two circuit switched connections. 4. The method of claim 3, wherein the two resources include one circuit switched connection and one packet switched connection. 4. The method of claim 3, wherein one resource is a voice call and another resource is a data transmission. 10. The method of claim 9,
Applying discontinuous transmission at the WTRU for the voice call, wherein the data is transmitted during the silence period of the voice call. The method of claim 3,
Assign a first training sequence to one resource;
Allocating a second training sequence to another resource, wherein the first transmission sequence is different than the second transmission sequence. A wireless transmit / receive unit configured to use orthogonal subchannels (OSC),
antenna;
A receiver in communication with the antenna;
A transmitter in communication with the antenna;
A processor in communication with the receiver and the transmitter
Including, the processor,
Decode the signal received through OSC,
And encode the signal for transmission via the OSC. A base station configured to use orthogonal subchannels (OSC),
antenna;
A receiver in communication with the antenna;
A transmitter in communication with the antenna;
A processor in communication with the receiver and the transmitter
Including, the processor,
Decode the signal received through OSC,
And encode the signal for transmission via the OSC. 14. The base station of claim 13, further comprising an interference canceller in communication with the receiver and the processor, wherein the interference canceller is configured to cancel interference from a received OSC, wherein the base station is capable of receiving two OSCs simultaneously. Base station.

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